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<h1><a name="C18"></a>Chapter 18: <a name="i0"></a>Untangle</h1>
<p>
You are given a number of points, some of which have lines drawn between them. You can move the points about arbitrarily; your aim is to position the points so that no line crosses another.
</p>
<p>
I originally saw this in the form of a Flash game called <a name="i1"></a>Planarity <a href="#p0">[7]</a>, written by John Tantalo.
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<p><a name="p0"></a>
[7] <a href="http://planarity.net"><code>http://planarity.net</code></a>
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<h2><a name="S18.1"></a>18.1 <a name="i2"></a>Untangle controls</h2>
<p>
<em>On Android, please touch for left click and long press for right click. Also note that where this manual refers to pressing a letter on the keyboard, the Android version has icons at the bottom of the screen instead (Control and Shift are not available). There is also an optional "Night mode" which uses darker colours in low light.</em>
</p>
<p>
To move a point, click on it with the left mouse button and drag it into a new position.
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<p>
(All the actions described in <a href="common.html#S2.1">section 2.1</a> are also available.)
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<h2><a name="S18.2"></a>18.2 <a name="i3"></a>Untangle parameters</h2>
<p>
There is only one parameter available from the &#8216;Custom...&#8217; option on the &#8216;Type&#8217; menu:
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<dl><dt>
<em>Number of points</em>
</dt>
<dd>
Controls the size of the puzzle, by specifying the number of points in the generated graph.
</dd>
</dl>

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